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support for [await]...of statements (#4627)

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This commit is contained in:
Alex Lam S.L
2021-02-08 20:28:23 +00:00
committed by GitHub
parent aedc1e7fc9
commit e13d1e9969
11 changed files with 203 additions and 64 deletions
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30
lib/compress.js
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@@ -347,7 +347,7 @@ merge(Compressor.prototype, {
&& !parent.is_expr_pure(compressor)
&& (!(value instanceof AST_LambdaExpression) || !(parent instanceof AST_New) && value.contains_this());
}
if (parent instanceof AST_ForIn) return parent.init === node;
if (parent instanceof AST_ForEnumeration) return parent.init === node;
if (parent instanceof AST_ObjectKeyVal) {
if (parent.value !== node) return;
var obj = tw.parent(level + 1);
@@ -930,7 +930,7 @@ merge(Compressor.prototype, {
tw.in_loop = saved_loop;
return true;
});
def(AST_ForIn, function(tw, descend, compressor) {
def(AST_ForEnumeration, function(tw, descend, compressor) {
this.variables.each(function(def) {
reset_def(tw, compressor, def);
});
@@ -1802,8 +1802,8 @@ merge(Compressor.prototype, {
abort = true;
return node;
}
// Scan object only in a for-in statement
if (node instanceof AST_ForIn) {
// Scan object only in a for-in/of statement
if (node instanceof AST_ForEnumeration) {
node.object = node.object.transform(tt);
abort = true;
return node;
@@ -2117,7 +2117,7 @@ merge(Compressor.prototype, {
if (!(expr.body instanceof AST_Block)) {
extract_candidates(expr.body);
}
} else if (expr instanceof AST_ForIn) {
} else if (expr instanceof AST_ForEnumeration) {
extract_candidates(expr.object);
if (!(expr.body instanceof AST_Block)) {
extract_candidates(expr.body);
@@ -2232,7 +2232,7 @@ merge(Compressor.prototype, {
if (parent.init !== node && parent.condition !== node) return node;
return find_stop_value(parent, level + 1);
}
if (parent instanceof AST_ForIn) {
if (parent instanceof AST_ForEnumeration) {
if (parent.init !== node) return node;
return find_stop_value(parent, level + 1);
}
@@ -3190,7 +3190,7 @@ merge(Compressor.prototype, {
} else if (stat.init instanceof AST_Var) {
defs = stat.init;
}
} else if (stat instanceof AST_ForIn) {
} else if (stat instanceof AST_ForEnumeration) {
if (defs && defs.TYPE == stat.init.TYPE) {
var defns = defs.definitions.slice();
stat.init = stat.init.definitions[0].name.convert_symbol(AST_SymbolRef, function(ref, name) {
@@ -3237,7 +3237,7 @@ merge(Compressor.prototype, {
if (defs === node) return node;
if (defs.TYPE != node.TYPE) return node;
var parent = this.parent();
if (parent instanceof AST_ForIn && parent.init === node) return node;
if (parent instanceof AST_ForEnumeration && parent.init === node) return node;
if (!declarations_only(node)) return node;
defs.definitions = defs.definitions.concat(node.definitions);
CHANGED = true;
@@ -5155,7 +5155,7 @@ merge(Compressor.prototype, {
pop();
return true;
}
if (node instanceof AST_ForIn) {
if (node instanceof AST_ForEnumeration) {
node.object.walk(tw);
push();
segment.block = node;
@@ -5788,7 +5788,7 @@ merge(Compressor.prototype, {
if (node instanceof AST_Catch && node.argname instanceof AST_Destructured) {
node.argname.transform(trimmer);
}
if (node instanceof AST_Definitions && !(parent instanceof AST_ForIn && parent.init === node)) {
if (node instanceof AST_Definitions && !(parent instanceof AST_ForEnumeration && parent.init === node)) {
// place uninitialized names at the start
var body = [], head = [], tail = [];
// for unused names whose initialization has
@@ -6456,7 +6456,7 @@ merge(Compressor.prototype, {
});
var seq = node.to_assignments();
var p = tt.parent();
if (p instanceof AST_ForIn && p.init === node) {
if (p instanceof AST_ForEnumeration && p.init === node) {
if (seq) return seq;
var def = node.definitions[0].name;
return make_node(AST_SymbolRef, def, def);
@@ -7330,7 +7330,7 @@ merge(Compressor.prototype, {
return if_break_in_loop(self, compressor);
});
OPT(AST_ForIn, function(self, compressor) {
OPT(AST_ForEnumeration, function(self, compressor) {
if (compressor.option("varify") && (self.init instanceof AST_Const || self.init instanceof AST_Let)) {
var name = self.init.definitions[0].name;
if ((name instanceof AST_Destructured || name instanceof AST_SymbolLet)
@@ -8661,7 +8661,7 @@ merge(Compressor.prototype, {
} else if (scope instanceof AST_For) {
if (scope.init === child) continue;
in_loop = [];
} else if (scope instanceof AST_ForIn) {
} else if (scope instanceof AST_ForEnumeration) {
if (scope.init === child) continue;
if (scope.object === child) continue;
in_loop = [];
@@ -10734,7 +10734,7 @@ merge(Compressor.prototype, {
if (assigned) return self;
if (compressor.option("sequences")
&& parent.TYPE != "Call"
&& !(parent instanceof AST_ForIn && parent.init === self)) {
&& !(parent instanceof AST_ForEnumeration && parent.init === self)) {
var seq = lift_sequence_in_expression(self, compressor);
if (seq !== self) return seq.optimize(compressor);
}
@@ -10857,7 +10857,7 @@ merge(Compressor.prototype, {
if (is_lhs(compressor.self(), parent)) return self;
if (compressor.option("sequences")
&& parent.TYPE != "Call"
&& !(parent instanceof AST_ForIn && parent.init === self)) {
&& !(parent instanceof AST_ForEnumeration && parent.init === self)) {
var seq = lift_sequence_in_expression(self, compressor);
if (seq !== self) return seq.optimize(compressor);
}